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  4. Perchloric acid is prepared by the action of concentrated sulphuric acid on :

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Q. Perchloric acid is prepared by the action of concentrated sulphuric acid on :

EAMCETEAMCET 1996

Solution:

Perchloric acid is prepared by the reaction of $ \text{NaCl}{{\text{O}}_{\text{4}}} $ (sodium per chlorate) with con. $ {{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}} $ as, $ \underset{\begin{smallmatrix} \text{Sodium} \\ \text{perchlorate} \end{smallmatrix}}{\mathop{NaCl{{O}_{4}}}}\,+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}NaHS{{O}_{4}}+\underset{\begin{smallmatrix} \text{Perchloric} \\ \text{acid} \end{smallmatrix}}{\mathop{HCl{{O}_{4}}}}\, $